The BGS Lexicon of Named Rock Units — Result Details

Blackbrook Reservoir Formation

Computer Code: BLK Preferred Map Code: Blk
Status Code: Full
Age range: Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description: Green to grey, graded volcaniclastic mudstones, siltstones and sandstones with massive beds of volcaniclastic sandstone and breccia.
Definition of Lower Boundary: Sharp contact with South Quarry Breccia Member of the Ives Head Formation.
Definition of Upper Boundary: Sharply overlain by Benscliffe Breccia Member, of the Beacon Hill Tuff Formation.
Thickness: c.625m
Geographical Limits: The unit extends from Longcliffe Golf Course south to Benscliffe Wood and then north-east to Grace Dieu Warren.
Parent Unit: Blackbrook Group (CBK)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Newhurst Quarry. 
Type Section  Blackbrook Quarry. 
Reference(s):
Carney, J N. 1994. Geology of the Thringstone, Shepshed and Loughborough districts (SK41NW, SK41NE and SK51NW). British Geological Survey Technical Report WA/94/08. 
Worssam, B C and Old, R A, 1988. Geology of the country around Coalville. Memoir of the British Geological Survey, Sheet 155 (England and Wales) 
Moseley, J and Ford, T D, 1985. A stratigraphic revision of the Late Precambrian rocks of Charnwood Forest, Leicestershire. Mercian Geologist, Vol.10(I), 1-18. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E141